Imports of package signer

PathSynopsis
crypto/tlsPackage tls partially implements TLS 1.2, as specified in RFC 5246, and TLS 1.3, as specified in RFC 8446.
github.com/theupdateframework/notary/protoPackage proto is a generated protocol buffer package.
github.com/theupdateframework/notary/trustmanager
github.com/theupdateframework/notary/tuf/data
github.com/theupdateframework/notary/tuf/signed